The Jump is the third and final mission in The Slums, and the sixth in the game.The player must power up two turbines to activate a couple of lifts, use the lifts to ascend the tallest building, then jump off the top over the boundary wall.

Two Cop Cars are out to get you, but do not pay attention to them.
Head into the sewers, roughly where your roadblock was in the previous mission: Both of the turbines are down here. When you find one, simply drive into the paddle as fast as you can (you can use a Kangaroo on command to help if you like). There is a power gauge on the bottom left of your HUD showing energy levels - when it reaches 100% you'll get a cutscene showing a lift being activated. Do the same for the other turbine, located further along the levee, for a cutscene of the second lift powering up.

Now drive out of the sewer, across the grassy area, and up a sloping road. At the top, follow the arrows off the road and down the narrow alley. In an alley, smash through the pane of glass on your right. Wait for the lift to arrive in the blue area, and ride it up to the next floor. Drive off the lift to the end of the corridor, where there is another lift area. Wait again, then catch this lift up to the roof. When you get up here, follow the arrows and drive off, over the wall.